I have posted a video to show use of bspline curves to create 3d models. This also shows how Python can be of great help if used with openSCAD This could seem a bit complex to the starters, but for complicated models the functions "bspline_surface" and "bspline" can be very handy if you know how to apply. Maybe of some interest to few of you https://youtu.be/vcF8QQvtpyU